miim

### MP-035 Y-axis counter fault

The amp/check/divide board detected a Y-axis counter fault. If the Y-axis uses a scale and reading head, then possible causes are:

- The gratings are dirty.

- There is too much DC offset.

- There is not sufficient amplitude in the read head signals.

- The read head skew angle is improper.

- The axis is moving too fast (over 40 in/sec.)

If the Y-axis uses a laser interferometer, then possible causes are:

- The laser beam is blocked.

- The laser beam is not properly aligned in the interferometer.

- There is too much DC offset in the OPD lissajous.

- There is not sufficient amplitude in the OPD lissajous.

- The axis is moving too fast (over 25 in/sec.)

What you should do:

1. To clear the error, click Clear error in the XYZ Display window.

To clear it using an RCU-II, press and hold down the Servo Power Off button and then press the Joy button twice.

2. If the axis uses a scale and reading head,

3. Clean the gratings using a soft, lint-free cloth and isopropyl or denatured alcohol.

4. Check to make sure the DC offset, amplitude, read head skew, and axis speed are within allowable limits.

5. If the error reoccurs, contact your Giddings & Lewis service representative.